function test(string) {
	var match = string.match(/-group(\d+)-/);
	if (match) {
		var numberAsString = match[1];
		var number = parseInt(numberAsString, 10);
		number += 1;
		numberAsString = ('00' + number).slice(-2); //Trick to have leading zero when necessary
		string = string.replace(/(-group)(\d+)(-)/, '$1' + numberAsString + '$3');
		console.log(string);
	} //else do whatever you want
}
 
test('/superbowl-XIX-group01-01/offense/11');
test('/superbowl-XIX-group08-01/offense/11');
test('/superbowl-XIX-group09-01/offense/11');
test('/superbowl-XIX-group10-01/offense/11');
test('/superbowl-XIX-group11-01/offense/11');

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